.app{
	width: 100%;
	height: 100vh;
	background-color: #ffffff;
	position: relative;
	display: flex;
	justify-content: center;
	align-items: center;
}
.btn72{
	width: 120px;
	height: 42px;
	font-weight: 600;
	font-size: 18px;
	line-height: 1;
	letter-spacing: 4px;
	background: transparent;
	border: none;
	display: flex;
	justify-content: center;
	align-items: center;
	position: relative;
	z-index: 0;
	transition: color 0.3s linear;
	cursor: pointer;
}
.btn72:before{
	content: '';
	width: 0;
	height: 2px;
	background-color: #1630f1;
	position: absolute;
	left: 0;
	z-index: -2;
	transition: width 0.3s linear;
}
.btn72:after{
	content: '';
	width: 100%;
	height: 0;
	background-color: #1630f1;
	position: absolute;
	z-index: -1;
	transition: height 0.3s linear;
}
.btn72:hover:before{
	width: 100%;
}
.btn72:hover:after{
	transition-delay: 0.3s;
	height: 100%;
}
.btn72:hover{
	color: #fff;
	transition-delay: 0.3s;
}